Geeetech G2s Upgrades

thingiverse

Superceded by v2 at http://www.thingiverse.com/thing:2157448 This is a series of upgrades for the Geeetech G2s printer that are designed to address the stock unit's design issues and produce better prints. The upgrades consist of printable parts that can be used with sourced components, and I've included the master assembly as both STEP and native Fusion360 files. Before printing, consider calibrating/compensating for material shrinkage by using a utility at http://www.thingiverse.com/thing:1982686 - but use whatever method works best for you. New Carriages The stock carriages use 2 cheaper bearings that result in significant play when the effector changes direction, putting torque on the carriage. In my case, I measured this to be up to .300mm using a good quality dial indicator near the towers. These new carriages show under .02mm deviation and use 2 additional linear bearings from Misumi LMU-N10 that can be ordered from their website at https://us.misumi-ec.com/vona2/detail/110300026540/?HissuCode=LMU-N10. The carriages are designed to accept metal spheres with M3 studs, like the ones provided in the Magnetic arm kit (listed below). Magnetic Arms The stock rod ends have 2 issues: they can't be exactly calibrated to the same length due to the manufacture of the threads on the rod and rod ends, and they're fairly cheap. I managed to get most of the slop out by center-punching the casing, but I wasn't happy with these either. I decided to go with good magnetic arms from Blue Eagle Labs: http://www.blueeaglelabs.com/products/haydns-carbon-fiber-arms-with-cnc-precision-machined-delrin-sockets. These have excellent holding power, are very accurately calibrated, and the metal spheres ride in machined Delrin sockets (spheres included). I chose the 215mm length, which works perfectly for the G2s. Effector and Hotend The Mk8 hotend was a pain to adjust the nozzles level, and limited the usable bed on an already small machine. I still wanted dual extrusion though, so I went with an E3D Cyclops: http://e3d-online.com/Cyclops. I added to this a 50mm blower fan for part cooling, as the stock unit is lacking this - a must as far as I'm concerned. Extruder The Cyclops hotend requires more force than the stock direct extruder can put out. I ordered 2 of the Greg's Wade Extruder hardware kit at https://www.ultibots.com/gregs-wade-extruder-hardware-kit/, and printed 2 sets of the extruder parts - 1 regular and 1 mirrored: http://www.thingiverse.com/thing:18379. In order to fit in the location of the original, you need to mirror one of the extruders, reverse the hobbed bolt, and use the attached spacer. FSR Probing I wanted a probe but couldn't decide on inductive, capacitive, BLtouch, etc. Some work with glass, some don't... The FSR's are awesome. I ordered the FSR kit from: https://www.ultibots.com/fsr-kit/. As far as I can see, this is the best solution for probing on this type of machine. Firmware I upgraded to Repetier firmware, and really like it. The printer seems much smoother. If you plan to do these upgrades, let me know and I'll upload the correct configuration file. Print Settings Notes: All carriage components in PLA for stiffness. Effector parts out of whatever is your go-to for high temp resistant material - I made my effector from Aluminum and printed the Cyclops mount out of Taulman Alloy 910. Extruder out of your choice - Nylon would be best, I chose PLA to get good detail on the gear set. FSR mounts out of the same material as the effector - Nylon, PC, ABS, etc. Good luck, happy printing, and leave a comment if you have any questions. How I Designed This Fusion360