If we consider the carriage as a beam then vertical alignment (i3) will flex less to bending forces. It's true that there the torsional force is greater in the vertical alignment. Another advantage with the I3, I think, is that the belt is aligned with the rods and bearings. For the I2, the belt (and force) is offset from the rods. I wonder if anyone did an analysis to determine if these factby Dom22 - General Mendel Topics
Can someone explain why horizontal is better? I don't see it.by Dom22 - General Mendel Topics
I want to change and improve my z-axis by changing the current m5 threaded rods. My decisions are still very much influenced by what I can conveniently and cheaply find. THSL-300-8D (8mm lead screws) are widely available from China on ebay and aliexpress. Are these an improvement over generic m5 threaded rods? Can anyone give me feedback on these lead screws & copper nuts?by Dom22 - General Mendel Topics
Google? YouTube? Any kit you buy will require tinkering, and lots of learning. Don't expect a set of IKEA assembly instructions. You will need to search for information to solve issues. This is part of the enjoyment of building from a kit. If parts are missing or defective, take it up with your supplier. And another thing, there is nothing wrong with cheap parts made in China.by Dom22 - General Mendel Topics
Thank You. There is a short (0.5ohm) between pins a13 and a14 on the 2560. Damn Sainsmart clone. I'm looking at the traces on the board under microscope and don't see anything obvious. I may end up butchering the board with my soldering iron. -- one option maybe to use T2 but I will need to modify the firmware. How easy is that? I'm having so many issues... Thanks again!by Dom22 - RAMPS Electronics
I need help troubleshooting thermistors. Using Repetier host, both bed and extruder have the same temperature when 1) no heaters are on, 2) both heaters are on, 3)4) either one of the 2 are on. I tried: 1. Thermistors seems to be fine -- connected each one to ohm meter and get appropriate readings (100kohm @ room temp). 2) Connected only the extruder thermistor to T0 (bed not connected). Reby Dom22 - RAMPS Electronics
OK, no smoke but I definitely smelled something sweet. I removed a pololu to verify the jumpers underneath. Then I reinserted the driver, making sure it it was the right direction. I turned on the power and after the bad sounds & smells, I realized the pins were offset (or shifted) by one row on the socket. Stupid. I set everything right and tried Repetier manual. NONE of my motors worby Dom22 - RAMPS Electronics
I'm worried about 18AWG yellow wire (of the ATX PS) being able to carry 11A. Since the 8 pin ATX12V power supply connector consists of 4 +12V and 4 GND wires, can I join 2 or more +12V yellow wires and connect to the Ramps board? ( And do the same with the black GND wires?). This would, in effect, split the current between the wires? I will use a different (2nd) rail for the 5 V connection.by Dom22 - Controllers
Need human "normal" 1:1 scaled heart for medical device (catheter) development. Catheter will pass in in the aorta, into the arch of the aorta and enter the coronary artery (right or left). Only this path is needed but ID geometry should be as accurate as possible. Walls of artery could be thicker than normal to make model more robust. I will put in 37C water (and probably add flow through itby Dom22 - Job Shop: I need stuff made!
I decided to order some longer screws to go through both boards. I'm just surprised that arduino design does not allow any clearance for screw heads.by Dom22 - General
Thanks, that would work. Now I have to find a local supplier.by Dom22 - General
M3 socket head will not fit. Nor any spacers or standoffs. Am I missing something?by Dom22 - General
Thanks for your replies. Even after tightening all the nuts, it is possible to flex the y-axis frame out of plane by picking it up and twisting it with little torque. Attaching it to a flat wood base is ideal -- actually (IMO) should be standard req for all Prusa builds.by Dom22 - General Mendel Topics
How do we align the Y-axis frame? I have the y-carriage on the assembly and need to tighten the nuts on the threaded rods (no vertical plate yet). Using a square and calipers, I'm able to get x-y squared and the carriage moves freely but 1 of the y-corners is off the table surface. The table surface is flat, although not level. I'm thinking the holes in the y-corners are not aligned/square.by Dom22 - General Mendel Topics
I like the v-slot rails and rollers design but no way it is cheaper. And you mentioned "not relying on printed parts". There is no universe where machined parts are cheaper than printed plastic.by Dom22 - General Mendel Topics
Design is not that new -- similar to the one from 3D LabteK. I am anxious to try it.by Dom22 - General Mendel Topics
The Ebay vendor did reply and said that it will work with 110V supply. There are no selector switches. I am concerned about using such a cheap PS -- 400W for less than $10 -- but it's what I got in the kit so I'll try it.by Dom22 - Controllers
The power supply is from Ebay The description on ebay says 90-264VAC but the label on the unit says 170-260VAC. I've requested the info from the supplier. I'll post the answer (if I ever get one).by Dom22 - Controllers
Hi, I have an LED power supply 12V-400W. The label specifies Input 170-260V - 50/60hz. The problem is I am in North America with 110/120V input. Will it work?by Dom22 - Controllers
Available on Thingiverse i3 Frameby Dom22 - General Mendel Topics