MK7 Extruder Block Mod

thingiverse

Modify your MakerBot MK7 Extruder Drive Block with this design by Peter Schmehl and me. This modified drive block supports filament completely, reaching all the way to the barrel/thermal barrier. If you're experiencing issues with filament curling and jamming between the drive gear and barrel, this design is for you. The models were printed on a MakerBot Thing-O-Matic, adjusted for Thing-O-Matic tolerances, and tested in both ABS and PLA. You may need to adjust the fit of the plunger with minimal effort. To install: 1. Print the two .STL files - front and back of the drive block. 2. Disassemble your MakerBot MK7 drive block parts, setting aside the two M3 screws that secure the old drive block to the motor. Do not disassemble the whole extruder. Be cautious with the plunger parts inside, including a derlin plunger, two plastic washers, and three metal washers. 3. Secure the front and back printed parts together using the two M3 screws before connecting them to your extruder. 4. Smooth out the filament holes with a 5/64" or comparable drill bit for easy filament passage. Test by sliding a piece of filament through the holes. 5. Mount the printed parts to the motor and assemble the extruder as usual. Adjust the drive gear position if necessary. 6. Test the extruder via ReplicatorG control panel. If the plunger fit is too tight, shave down the back of the plunger cavity with an xacto blade or file. Happy printing!