Search found 176 matches

by chumm
Sat Dec 02, 2017 5:54 am
Forum: Help requests / Purchasing assistance
Topic: Weird Z Axis Problems and Skipping
Replies: 10
Views: 2673

Re: Weird Z Axis Problems and Skipping

Taking another look at the printrboard, it seems the onboard drivers don't have heatsinks? This could be an overheating issue. You can get tiny heatsinks pretty easily, they're usually listed as VGA RAM heatsinks . Just stick them straight onto the top of the A4982 chips after cleaning with a little...
by chumm
Sat Dec 02, 2017 12:12 am
Forum: Help requests / Purchasing assistance
Topic: Weird Z Axis Problems and Skipping
Replies: 10
Views: 2673

Re: Weird Z Axis Problems and Skipping

Sounds like it's narrowed down to driver or electronics, so yeah it might be time to try out a new board. The upshot will be more customization and upgrade options opened up as a result, downside is it looks like that printrboard is really compact and convenient for the size of the case, you might h...
by chumm
Fri Dec 01, 2017 11:28 pm
Forum: 3D Printers
Topic: Suggestions for Modified "Dolly" Printer 300x300x300 Dual Extruder 24v
Replies: 4
Views: 1625

Re: Suggestions for Modified "Dolly" Printer 300x300x300 Dual Extruder 24v

Prints look nice! A note on 0.9 steppers: I also saw that post and bought 0.9s for my first printer. I'm not entirely convinced that there's a significant benefit to the maximum resolution possible, which makes that comparison picture very strange. Using DRV8825 drivers with 1/32 microstepping, my m...
by chumm
Fri Dec 01, 2017 10:53 am
Forum: Help requests / Purchasing assistance
Topic: Weird Z Axis Problems and Skipping
Replies: 10
Views: 2673

Re: Weird Z Axis Problems and Skipping

Is the heated bed connected to the same power supply that runs the rest of the printer? If it shipped without a heated bed it might have a power supply that is too small to maintain current on all the motors and the bed simultaneously. You could test this by doing a long PLA print without heating th...
by chumm
Mon Nov 27, 2017 4:19 am
Forum: Help requests / Purchasing assistance
Topic: setting for subsecuent extrusion lines?
Replies: 2
Views: 1016

Re: setting for subsecuent extrusion lines?

When the nozzle deposits the plastic, the printer is expecting it to be pushed out to the sides to make the lines thicker, based on how high the nozzle is placed from where it is printing. Those lines should press up against each other slightly, filling in the gap you see. When the lines are separat...
by chumm
Mon Nov 27, 2017 4:02 am
Forum: 3D Printers
Topic: Suggestions for Modified "Dolly" Printer 300x300x300 Dual Extruder 24v
Replies: 4
Views: 1625

Re: Suggestions for Modified "Dolly" Printer 300x300x300 Dual Extruder 24v

I'm fine to go MKS Gen instead of ramps, but the boards I see only show 1 plug for an extruder even though description shows 2 extruder capable. ( https://www.ebay.com/itm/222615581571 ) either that or it seems like only 1 z axis motor plug, not sure... It's the latter, the plugs in that pic are X,...
by chumm
Wed Nov 22, 2017 10:36 am
Forum: 3D Printers
Topic: Dolly DRV8825
Replies: 13
Views: 2270

Re: Dolly DRV8825

Too hot to hold is a convenient guideline for whether the motors are too hot for continued operation. 60-70 C is roughly the recommended maximum temperature for most standard steppers, anything over 80 gets into damaging territory over time. Since you can heat your bed and test your hold temp (all o...
by chumm
Mon Nov 20, 2017 4:03 am
Forum: 3D Printers
Topic: What would be your "perfect" entry level printer?
Replies: 4
Views: 1484

Re: What would be your "perfect" entry level printer?

Agreed that you can skip a heated bed and auto bed leveling, but I do think SD card and LCD support are important (and pretty cheap to implement. That said, having looked into making something compact and nice myself as a desktop alternative to my bulky diy printer, it's really hard to compete with ...
by chumm
Sat Nov 11, 2017 3:16 am
Forum: 3D Printers
Topic: Dolly DRV8825
Replies: 13
Views: 2270

Re: Dolly DRV8825

That board should be fine. I'd start with trying the X motor driver and X motor, which you know are working, with the other motors/drivers/slots on the board to isolate the problem. Grinding usually means either insufficient current or a poor physical connection.
by chumm
Sun Nov 05, 2017 8:09 pm
Forum: 3D Printers
Topic: Dolly Configuration
Replies: 38
Views: 5548

Re: Dolly Configuration

It should be an observable problem. If the temp stays X degrees below the target for Y seconds, it will trigger runaway protection. The Pronterface temperature graph should be able to show you at least generally the nature of the problem, in particular whether it's a sudden drop of the detected temp...