gripstruder 4x the grip force, in many cases this means extruding prints at over 800mm/m of 1.75mm feedstock

thingiverse

this is to be called the 'gripstruder' for its exceptional griping of feedstock. 12/1/2014: recent addition of file xt5.stl , that has support that needs cut away, it deals with prolong use fatigue, and unifies lever pulley arm. best if level arm that holds bearings is made of ABS. other parts PLA is ok, just so much stress load is on arm that head cycles from motor heat tend to wear the original part out, abs is more graceful. part hinge is bolt of motor, and other parts are not under stress of load where it heats up. video here: https://www.youtube.com/watch?v=ZcHtu8XVnBk&feature=youtu.be i have uploaded a part called mount_withbolton, it is an update that has bolt holes to fit on seemecnc mount plate requires 2 608 bearings, a 2inch 6/32 bolt, 2 washers, a high compression spring, and a 3mm flat heat bolt about 6mm in length, and a flat head 6/32 1 inch long phillips bolt. then whatever bolts you use to mount to your motor, also requires a bowden metal grip likely from seemecnc. this design was inspired for faster printing with my rostock max delta bot. this design allows for strong grip of feedstock and 4 times the surface area to grip as normal extruder pinch grips. the mechanism that holds feedstock is the pressure between two 608 bearings, each bearing has twice the contact surface of the R2ZZ bearing, and then there are 2 of them. this allows 4 times the surface area to apply pressure, meaning more force can be applied and feedstock will not reshape. I have tested this extruder design up to 800mm/m flow rates. Instructions take the bottom part of the idler, push onto it two 608 bearings. there is a built in groove surface to allow outside of bearing to rotate freely. then take the top idler part, and a flat head 3mm or 6/32 screw and thread it thru the top part, and then thru the bottom part, then take a 3mm flat heat bolt and thread and screw it into the round part of the idler. the idea is that the idler should come together as one piece and have little play. after this take the big idler block and mount it to a motor, then take a 8mm gear hobbled mount and place it on the motor shaft. slide feedstock thru and let the motor mount fit where it should based on the position of the feedstock. be sure the grub screw completely sinks into the hobbled gear mount on the motor shaft so it does not rotate around and get caught by the bottom bearing. place the idler arm inside the screw mount as it has the strength to support the arm, then place a bolt long enough thru the bottom of the motor mount screw hole, and thru the idler screw hole. then place a washer, a high compression spring, and another washer and a nut at the end. keep it loose for now. then seemecnc idlers include a metal mount to go to bowden extruders. this mount snaps into place with pliers. be careful not to tear the plastic, i gripped the top side by the metal, and the bottom by channel locks. make sure the holes are unobstructed, i used a small but long screwdriver that had a 2mm shaft and worked it thru the metal part, and the plastic and thru the other side. you want feedstock to move freely but not to buckle. i have included images, and will update instructions more later. enjoy!