Dr Boo's Parameterised FSR Groove Effector for Delta Printers

thingiverse

HEY, STOP! READ THE NEXT PARAGRAPH FIRST AND FOLLOW IT INSTEAD! I've fixed some issues in this design so take a look at http://www.thingiverse.com/thing:520580 for a better version that I would not use myself because it's way more improved. The new one has all sorts of nice touches you won't find here! This is an effector assembly for Delta printers designed with total customizability in OpenSCAD and available in STL too - it's got a lot of innovative parts as per comments inside SCAD file! I used force sensitive resistors FSR402 on the printer head to enable cool z-probing, cleverly integrating a spring mount. This effector originated from http://www.thingiverse.com/thing:273232 (thanks Nathan Matthews!). Placing FSR directly on printer assembly was popularized at http://www.thingiverse.com/thing:386146 (credit Ed Lep), but I put my spin by positioning FSRs directly above the print head, then limiting their motion so nothing falls out of place. As it's all still under construction don't take anything as fact, but from what I see this will probably be great. It's a huge leap into OpenSCAD design for me and only printing preliminary prototypes; your input welcome! ** Fix: Bottom part shown is flipped around - ignore it for now and don't even worry about assembling yet. We've got plenty to cover. Update, I get some bad positioning at "Print this section", just grab effector & plunger separately or simply the clamps for print heads. Instructions To join the j-head onto the plunger: Use an M3 screw of length 40mm passing through each of the outer holes and attach tightly with embedded nuts; but let the head sit at its 'sloppy' state allowing smooth movement up-down motion. Just below, place a 22 mm compression spring atop this threaded shaft (where appropriate), on it should rest another spring on that little screw hole that was there. As your plunger moves forward above all, a set of 3 tiny springs (called force-sensitive-resistor buttons or buttons with rounded surfaces) at bottom tip touch the heads on three FSR402 mounted right above them; in wells made specially for just this reason. Underneath plunger sit components meant for j-head to clamp firmly using T shaped mounting design, here the screw goes down from above to keep everything secured well with nut heads. The assembly can move around a bit, still try fixing all pieces according together so it fits inside a specific frame first before final adjustments. You need simply fit push-fits onto top with threaded screws (using 2 small flat springs) then attach head to Jhead by running 3x 5mm wire on the spring mount (don't mess these). The mechanism should do its job by moving vertically. You know, that one: plunger head moving back & forth because we've fitted spring in a hexagonal mount for limiting all rotations! Ed Lep created something cool - here I changed it so it'd fit perfect. In summary, j-head has vertical restriction but rotational is still relatively free.