Update on Tevo Tarantula!

7. April 2018 16:27 by Cameron in 3D Printing  //  Tags: , , , , , , , , , , , ,   //   Comments

It's been a little over a month since my last update on my Tevo Tarantula. All of the previous planned upgrades are now installed and I am fine tuning to get high quality prints.

My dual extruder and large bed upgrade kits arrived the last week of March and I got both configured in Marlin and reflashed the firmware. The large bed upgrade was easy enough once I moved the Y-endstop to the back of the aluminum extrusion and adjusted the X-gantry position. Once I had everything heated up to test my second extruder, I noticed that my second extruder driver wasn't tuned correctly and the motor was clicking and didn't extrude. I adjusted the voltage on the E1 driver (stupidly without a multimeter) and eventually I turned the potentiometer too much and it ultimately broke. Since I had the stock MKS 1.4 base board, the stepper drivers were integrated, and I couldn't replace them. Because of this, I had to order a replacement board if I wanted to use the second extruder.

I wanted to avoid issues with stepper drivers in the future and I ordered an MKS Gen L board which has replaceable drivers. I also ordered two sets of DRV8825 drivers (5 pack) so I could be sure to have backup drivers in case I needed them. As it would turn out, I did need them! I didn't realize that the drivers were cranked up to 1.6v when I powered on the printer. I burned through 3 of the extra 5 drivers before realizing I needed to configure the jumpers for each driver and adjust the voltage down to 0.75v (this time with a multimeter).

These DRV8825 drivers run much quieter than the stock A4988 drivers and before I replaced the drivers, I had installed stepper motor dampers on the X and Y axis. Now printing is extremely quiet! As a future upgrade, I am going to replace all of the stepper drivers with TMC2208s which should make the printer virtually silent aside from the fans. Maybe I can replace the fans at a later point to reduce noise. The great thing is that I can now run prints at all hours of the night and day with minimal noise.

I decided I would go for the dual-Y rail upgrade to provide more stability for the build plate and reduce ghosting in my prints. I still need to print all the necessary components for this upgrade, but it will be a huge improvement once implemented. After I install the dual-Y rail upgrade, I'm hoping this will be the last upgrade I need to make on this printer for a while. Of course, I will always be tuning little bits along the way to improve quality. Originally, I got into 3d printing to enable me to print enclosures for electronics projects for Raspberry Pi and Arduino. However, this has evolved way past that and I'm thoroughly enjoying the process of building/tuning the printer and creating neat prints. Many friends and family members have asked me to 3d print various objects for them as gifts or toys. I think that is really cool and I'm happy to do that for them. I've also helped troubleshoot issues on friends' DIY 3d printers with the knowledge that I've gained from working on my printer.

One of my latest prints before my last rebuild was of the Millennium Falcon (named Fillennium Malcon on Thingiverse). I am pretty happy with how it turned out and it now sits on my desk at work. I printed the model at 60% scale with Cura. It took roughly 4.5 hours to finish printing. I had one failed attempt trying to print at 40% scale and about 70% into the print, the part fell over onto the build plate. This was due to my not printing a proper raft. On my second run, I made sure to print a large raft to avoid the same thing from happening.

I will soon be looking into PVA as support material for more complex models with dissolvable supports. I just need to see about how to properly store PVA since it is very sensitive to humidity. Perhaps I can invest in a single spool enclosure for the PVA. Cura's support options for PVA are somewhat limited meaning that it can only designate supports to one extruder. This will result in using a lot of PVA to support larger objects. Simplify3D and Slic3r Prusa Edition have an option to print PVA on only the areas that touch the model and your primary material for the rest of the supports. I am still deciding whether I want to buy Simplify3D when Cura suits 95% of my needs for everyday printing. At the price tag of $150, it better have pretty compelling features for me to make the switch from Cura. If I see myself burning through my supply of PVA quickly, Simplify3D would pay for itself in the long run. Rolls of PVA run for $35-50 which would be less expensive over a long period of time with Simplify3D.

Update on Tevo Tarantula

3. March 2018 17:16 by Cameron in 3D Printing  //  Tags: , , ,   //   Comments

The dual-z axis upgrade kit came in this past week and I've been working on tuning the two lead screws to move together. This has been slightly challenging since I have two z-axis motors which can move out of synchronization. This results in having to adjust the Z-offset on my hotend occasionally and re-calibrate the bed for better first layer adhesion. Since the lead screws are not perfectly aligned up and down, there is quite a lot of vibration which causes a loud screeching sound during bed leveling and homing. I have tried using a hand level to get the lead screws aligned properly, but this has been difficult.

Instead, I am going to try using a single motor pulley system to drive both lead screws. I will need to print new brackets for this setup. The motor is mounted inverted which will hopefully decrease the wobbling. I was able to source most of the parts needed for this upgrade from the United States. The only piece I couldn't find was the closed loop GT2 timing belt. I ordered two new lead screws in case either of the ones I had from Tevo were accidentally bent slightly. I am hopeful that this will make my z-axis virtually quiet and will also improve my print quality immensely.

I am using supasorn's belt tensioner and dual-z axis design from Thingiverse. You can find his profile here: https://www.thingiverse.com/supasorn/designs

On both of his belt tensioner and dual-z axis pages, he has pictures of flawless 20mm calibration cubes. This is my ultimate goal after making these upgrades.

I ordered a dual-extruder kit and large bed kit from Tevo and hope to see those by late March/early April. In the meantime, I will be printing/tuning around the clock to get my workspace more organized. My desk is just covered in electronic boards and wires at the moment. I did finally manage to print the TUSH filament holder so I no longer have a ghetto filament holder setup.

Since I have my printer working well enough now, I thought I would try and print Maker's Muse Lattice Cube design. I made two separate scaled prints of the cube. The first attempt at printing the lattice cube did not work too well. I had scaled it to 25% in Cura, but the print came out a bit rough. There wasn't much room for the nozzle to move around freely at that scale. The cube nearly completed, but the nozzle got stuck on the top of the cube, near the end of the print, and I had to abort the print. In my second attempt, I scaled to 40% and printed with my silver PLA. The print took roughly an hour and the result is quite nice! After I tune my printer a bit more, I may try some of the more advanced designs.

I ordered some more colors of PLA filament (yellow, red, green). I would like to print all of the low poly designs (namely Pokemon to start) and I will be collecting different colors of PLA over the next few months. I would like to try some other materials soon, but I am not sure whether I want to try PETG or ABS. I am interested in flexible filament, but I'll need to modify my extruder to support those. I will be investing in PVA at some point in the near future too.

That's it for now! I will continue to post updates as I make more progress. I am going to work on a beginner's guide to building/configuring/upgrading their Tevo Tarantula soon.

Progress with my Tevo Tarantula

11. February 2018 15:30 by Cameron in 3D Printing  //  Tags: , , , , ,   //   Comments

It's been a couple of weeks since my last update on the printer. Since my last update, I have received my aluminum brackets and replaced all of the original acrylic parts with their aluminum counter parts. The build is much sturdier than before. However, I have found that it is harder to get the bed manually leveled due to the rigidness of the frame. I'm in the process of getting a BL Touch sensor installed to allow for a less strict leveled bed. This should improve print quality and not require me to level the bed anymore. Previously with the acrylic parts, I could get away with less of a leveled bed and get high quality prints.

I've been trying to print pieces for my electronics enclosure, but the prints keep failing due to the large surface area and the bed not being perfectly level. Most of the time, the print would be fine until close to the end and then there would be some layer shifting that ruins the print. This is unfortunate because the part I'm trying to print takes 6-7 hours to print and most of the time I've set it to print over night. When I come back to the print in the morning, I find that the print has failed. I'm fairly confident that installing the BL Touch sensor should fix most of these issues.

I'm currently working through which version of the community firmware to install on my printer. I have Jim Brown's Easy Config based on Marlin 1.1, but for some reason, the BL Touch doesn't appear to work correctly for the Z-endstop and when I do the auto home mechanism, the print nozzle crashes into the bed. I'm going to try a few other firmware configurations available from the Facebook group. There are a few guides referring to the BL Touch and specific firmware releases. I'm fairly certain the BL Touch is not at fault because when I power on the printer, it deploys/retracts the sensor a few times. I expect that it's a firmware configuration issue and I should be able to get it working in the next few days.

I have a seconds Z-axis rod/motor kit coming from Tevo in the next couple of weeks. That should help with Z-axis stability and print quality. Most people say this is not necessary, but I don't think it will hurt. Once I have the BL Touch installed, I will do some before/after comparison prints with/without the dual Z-axis kit. I've also ordered a large bed sticker from Tevo to apply to a large bed that I will purchase from Amazon. I'm attempting to stay as stock as possible, but the kits from Tevo tend to be a bit more expensive and they take longer to ship from overseas than from a seller in the US. Eventually, I want to get a dual extruder upgrade, but I'm not sure if I will go with Tevo or source the parts separately from Amazon. I found a dual extruder kit on Amazon that is roughly half the price of Tevo's, but I would need to get a second extruder motor and part assembly. Because of the price of the individual components, it might just make more sense to get Tevo's kit. I'm mainly interested in printing complex models using PVA (water soluble) for supports and PLA/ABS/PETG for the model.

I will continue to post updates on the print quality and upgrades soon!

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