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!

Beginning 3D Printing with the Tevo Tarantula

27. January 2018 17:24 by Cameron in 3D Printing  //  Tags: , , , ,   //   Comments

After selling the Monoprice printer, I still wanted to venture into 3D printing, but I wanted something with more accessible parts if servicing is needed. I researched some DIY kits for a little while and ultimately chose the Tevo Tarantula. The Tevo Tarantula is a Chinese Prusa i3 clone I ordered from Gearbest and the printer kit arrived in about 10 days from Malaysia. Note, I had to get a shipping upgrade for the 10 day speed. Your mileage may vary depending on different shipping conditions. Once I had the printer in my possession, base assembly and calibration took about 15 hours. I struggled a little with the initial steps of getting the frame put together. Some other challenging parts of assembly included the T-nuts that were difficult to lock in place on the frame. They would tend to slide around and come lose after I had tightened up the bolts.

After I assembled everything and hooked up the electrical, I flashed Jim Brown's fork of Marlin 1.1 and went through the initial setup of the firmware and began the bed leveling. Be sure to copy/paste the example configuration from the repository over the existing configuration in Marlin. The bed leveling was a little difficult with the small thumb screws on the corners of the build plate. You can improve this design by printing plastic pieces to make the screws a bit larger for easier adjusting. I ran through the homing of the axes one at a time. When I got to the Z-axis homing, the acrylic bracket snapped in half and I was unable to continue without a new part or fixing the existing part. The good thing is that acrylic parts can be glued back together, but I recommend printing a new set of brackets or getting aluminum or carbon fiber replacements. I have ordered an aluminum set of brackets that I will use to replace the acrylic pieces. After I glued the acrylic Z-motor bracket back together, I was able to successfully get it re-installed onto the frame of the printer.

I leveled the bed one last time and printed a calibration cube. I had attempted to print from the supplied SD card directly from Marlin, however, I couldn't get a good print so I opted for Cura instead. Cura 3 has a profile for the Tevo Tarantula which is nice as I didn't have to configure too much to begin printing. In the near future, I will be using Octoprint to do printing remotely.

My upgrade journey is far from over! I have many improvements that I would like to print that will improve print quality and electrical safety. I plan to print a nice case for the screen (large full graphic screen), main board, power supply, mosfets (currently only have one for the heated bed), and Raspberry Pi 3 (Octoprint). The case will be good for cable management and keeping the dangerous high voltage power away from my hands. Currently, my printer is a bit of a hot mess with wires hanging all over (none are touching the print bed as that would be a fire hazard!) and the power supply has a small piece of plastic covering the exposed terminals for the electrical connections. I don't like the power supply design as it stands. I wish they had at least hardwired a power socket to cover up the exposed terminals.

I expect that printing these upgrades will take most of the week and I should have most upgrades in place soon! I will continue to post more updates for the printer!

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