Search found 1155 matches

by ednisley
Mon Nov 30, 2020 6:59 pm
Forum: Getting Started
Topic: Overhang threads
Replies: 7
Views: 4607

Re: Overhang threads

width of the ramp only needs to be ~ 3 mm Because the threads run perpendicular to the slope of the ramp, you're not ever going to get a sliding-smooth surface, particularly if the matching object is also 3D printed with a matching thread orientation. The central problem is building a slope by sque...
by ednisley
Thu Nov 05, 2020 6:17 pm
Forum: Tech Support
Topic: 1st Gen M2 heat bed dead again :(
Replies: 3
Views: 816

Re: 1st Gen M2 heat bed dead again :(

That little green LED is on Mmmmm, my remembery has failed. I thought there was an LED on the edge of the platform, connected in parallel with the heater power. That's not what you have, alas. Turn the power off, unplug the heater connector at the platform, and measure the heater resistance. If it'...
by ednisley
Thu Nov 05, 2020 3:19 pm
Forum: Tech Support
Topic: 1st Gen M2 heat bed dead again :(
Replies: 3
Views: 816

Re: 1st Gen M2 heat bed dead again :(

original 12v PSU brick's LED is on as well The fundamental problem is the absurdly high current drawn by the 12 V platform heater. All those LEDs show the low-current control path works fine, but I'm reasonably sure the teeny LED on the front of the platform isn't glowing, so the high-current path ...
by ednisley
Fri Oct 30, 2020 11:41 pm
Forum: Tech Support
Topic: Strange Z motor move
Replies: 6
Views: 511

Re: Strange Z motor move

The five numbers within the curly braces set the current for the X, Y, Z, E1, and E2 motors, in that order.

Change the third 135 to whatever value produces enough torque to lift that aluminum platform. Try 185 first, then 215.

So, for example:

Code: Select all

#define DIGIPOT_MOTOR_CURRENT {135,135,215,135,135}
by ednisley
Fri Oct 30, 2020 2:12 pm
Forum: Tech Support
Topic: Strange Z motor move
Replies: 6
Views: 511

Re: Strange Z motor move

Any idea? Make sure the Marlin firmware sets a sufficient current for the Z-axis motor. Look for DIGIPOT_MOTOR_CURRENT in either Configuration.h or Configuration_adv.h (which file depends on the Marlin version you're using) and change the Z-axis value as needed. The normal value seems to be 185. Re...
by ednisley
Wed Oct 07, 2020 12:44 pm
Forum: Tech Support
Topic: stange Z movement
Replies: 8
Views: 1013

Re: stange Z movement

a short video If you can move the platform smoothly from bottom to top with just finger torque on the leadscrew, then replace the motor. For conclusive proof, remove the four screws holding the Z-axis follower nut to the platform, hold the platform near the top, and home the Z-axis. If the leadscre...
by ednisley
Wed Oct 07, 2020 12:35 pm
Forum: Tech Support
Topic: M2 Dual extruder. No power to both extruders
Replies: 5
Views: 614

Re: M2 Dual extruder. No power to both extruders

Do they run off the same chip? At least on the RAMBo V1.3, there are two driver chips. Seems unlikely that both blew at the same time. Stranger things have happened, but, at this point, I'd break out the oscilloscope to verify the chips are getting step pulses from the microcontroller. That bifurca...
by ednisley
Mon Oct 05, 2020 11:34 pm
Forum: Tech Support
Topic: stange Z movement
Replies: 8
Views: 1013

Re: stange Z movement

Try to clean with alcohol and lab With the power off , unplug the motor and turn the leadscrew by hand (well, fingers) to move the platform from top to bottom and back again. I think you'll find some sections, probably in the middle of the travel, will require much more effort than others. Concentr...
by ednisley
Mon Oct 05, 2020 1:47 pm
Forum: Tech Support
Topic: M2 Dual extruder. No power to both extruders
Replies: 5
Views: 614

Re: M2 Dual extruder. No power to both extruders

The extruder motor works when plugged into Z axis Well, then, it's: one of those mysterious firmware issues a blown driver chip If you ever, even once, connected or disconnected the stepper with the power on, then it's a blown driver. If you had a single-extruder machine, you could tweak the firmwa...
by ednisley
Sun Oct 04, 2020 7:40 pm
Forum: Tech Support
Topic: stange Z movement
Replies: 8
Views: 1013

Re: stange Z movement

start to go up suddenly it began to go up and down rvery few seconds It's time to clean & lubricate the guide rods and leadscrew: they're now dirty enough to stall the underpowered Z-axis motor. AFAICT, the right time to clean & lube is when the motor stalls, rather than pretending to do regular ma...