Rudy102

Fixed, changing DEFAULT_MAX_FEEDRATE and DEFAULT_MAX_ACCELERATION for Z axis to smaller value helped.

The motor is fine, also moves are correct in pronterface. The issue is only appearing in fast raising of the bed, for example at first power up uf the printer when it lower bod to bottom, and then fast raise it up to nozzle. It's look like too much acceleration but Im' unable to find comand for Initial startup of printer in Marlin for Z raise

Frame is UMO, motherboard with lcd from UM2, heated bed with lead screw from UM2, igus rails and bearings on Z and XY axis, aluminium XY carriage, UM2 style print head with Olsson block dual extrusion. I can't see anny jumper on motherboard, something is not right because with stock 200 steps the Z axis is doing around 1/4 of normal movement. Edit. Found the jumper, it was open so in 1/8 step. Using prusa calculator for my acme srew with 2mm per rotation I get 800steps. It's correct for movement but when asking printer for a move from 200 to 0 it scream and not move.. Not sure is it related to hardware issue or too much acceleration for example.

Hi all, I have finally assembled my heavilly moded ultimaker, it's running um2 electronics and bed. My issue is that after loading stock firmware the Z axis after, lets say command for move 10cm, only do 1mm. After changing the steps, from stock 200 for Z axis, to 800 and having correct reaction to gcodes for moving, the axis is not able to do fast moves. When for example want to move it from 200mm to 5mm it only scream and stay in place. Anny ideas how to fix this? :( I have played with steps, current, microstepping, but it seems to not work :(

Hey @Rudy102, I went ahead and published a version for you. In return. you just have to let me know how the Igus bushings compare! I've been using a lot of their products lately, and even printed some of their filament. Good stuff. I also added a new tighter belt clamp variant. I think some people have had issues with a lack of clamping force, which could be caused by layer height settings causing the clamp to be too thin. Thanks a lot @lars86! I will print them and tell You how they came out. Unfortunatelly my ultimaker is still in building phase (waiting for motherboard). Im using Igus WSM-0810-15 bushings with their AWMP-08 rods. The issue is that the bushings should be fitted with H7, otherway there will be some play. I have actually found that even in the proper press fit, their bushings are closer to the top of quoted tolerance. Hopefully you can get enough out of the clamping bolt to snug it up well and tune the fit. That bolts threads into a real nut, so you should be able to clamp pretty hard. You might also be able to source shafts with a bigger nominal size that fit nicely. Are you worried at all about extra deflection from using aluminum shafts? Well, it's not going to work. I have returned the igus shafts and bushings, the fit is too lose. The only way to go with igus is to press fit the bushings with H7 fitting, which I won't be able to get with printed parts :/ Im sticking to original bushings on 8mm shafts, but I will give a shot for igus RJMP 6mm on print head with their rods.

Hey @Rudy102, I went ahead and published a version for you. In return. you just have to let me know how the Igus bushings compare! I've been using a lot of their products lately, and even printed some of their filament. Good stuff. I also added a new tighter belt clamp variant. I think some people have had issues with a lack of clamping force, which could be caused by layer height settings causing the clamp to be too thin. Thanks a lot @lars86! I will print them and tell You how they came out. Unfortunatelly my ultimaker is still in building phase (waiting for motherboard). Im using Igus WSM-0810-15 bushings with their AWMP-08 rods. The issue is that the bushings should be fitted with H7, otherway there will be some play.

Hi there, really good project. Is it possible for You to upload your cad files? I want to use Igus linear bushings whith have 10mm OD. I need to change it in design, but I cant do it with stl files from Youmagine :/ Or can You change that for me?

Thanks for the answer Neotko, Since I wanted the UM2 head I was going to use pt100 sensors and buy um2.1 board from aliexpress. I started to think about replicape, because it looks nice, but there is not much infromation about it used in printers, so I'll probably stay with the um2.1 board.

Hello to You all, Im new to this forum, so sorry for all the mistakes. Also, sorry for my English, Im not a native speaker also.. After two years of fun with self sourced repraps, I have decided to build my own Ultimaker. After some research I have decided to build UMO +. In my opinion it's almost identical to UM2, but it's hard to find 6mm Dibond in my country (the price is killing). Also, laser cutted option was easier and cheaper, with similar quality. Right now Im collecting all the needed parts. I have decided to use in my build Igus linear system- rods and bushings, nice 0.6Nm 42mm motors, GT2 belts, 12mm ball screw for Z axis and UM2 dual extrusion print head. And motherboard is where I have problem now.. At the start I was planing to buy UM2 motherboard with oled display from Aliexpress for 140usd. But right now I have just found the Replicape + beagle bone black for 149usd. The UM2 board is nice, but the Aliexpress ones are not the original boards, and the Replicape with BBB is original one for almost the same price. Unfortunately I can't find much about the Replicape. Have annyone tried it and can tell me something more? Will it be a good option to use in my UMO+? Im not planing to spend more than +/- 150usd for motherboard. I'd like to hear anny comments from You guys. Thank you, Kris