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General discussions. For specific printers / electronics / fabrication methods / softwares, please see other sections.
Re: Hlidskjalf, Dual CoreXY - 7 years ago
Quotethe_digital_dentist Something has been bugging me about this printer from the first post. How do you pronounce "Hlidskjalf"? It sounds like something you'd find in an Ikea catalog... LOL, Tools required: computer with internet access, monitor, mouse, and listening device. 1. Select the "play" right pointing blue triangle from the link below with the cursor on your monitor by depressing aby prot0typ1cal - CoreXY Machines
Re: Hlidskjalf, Dual CoreXY - 7 years ago
Quotedc42 Firmware 1.19beta7 includes the CoreXYU support. I hope to release it later today. Sweet, I'll keep an eye on GitHub. Gonna be a busy weekendby prot0typ1cal - CoreXY Machines
Re: Hlidskjalf, Dual CoreXY - 7 years ago
@bobbyd dc42 is mainly a Duet guy. His version of RepRapFirmware also supports RADDS, even though the configuator doesn't list RADDS as a controller board. I'm new to code, and am trying to figure out how to build a RADDS version with CoreXYU, and where is the bin file after building (compile).by prot0typ1cal - CoreXY Machines
Re: Core XY vs Hbot Build - 7 years ago
@o_lampe The formulas for Markforged are correct, to maintain X position while Y moves, both A and B must synch. If Y doesn't move (delta A) then only B drives X. FUBAR = F**ked Up Beyond All Recognition. Referring to the blue belt path being skewed (not right angles and parallel run to the gantry). Fairly sure the Macrondynamics video is H-Bot, no crossing belts. Belts are pretty tall, at leasby prot0typ1cal - CoreXY Machines
Re: Core XY vs Hbot Build - 7 years ago
691175002 Design looks promising. May want to place all 4 steppers in the rear, to tidy up the wiring harness. Here's a video of a really big H-bot, for those that are interested: There's a guy who is making a CoreXYU similar to mine, except no belt reduction and all four steppers in the front, I think he's going to call it Mjölnir. There's also Lars, who already has modified Duet firmware:by prot0typ1cal - CoreXY Machines
Re: Core XY vs Hbot Build - 7 years ago
Hmm.. IDK about the H-Bot gantry being heavier? In both CoreXY and H-Bot the motors are stationary, and are not coupled to the gantry. In the case of an IDEX design, like the FolgerTech FT-5, or BNC3D Sigma, yes, the X motors are mounted to the gantry. H-Bot only requires 3 idlers on the gantry, while CoreXY 4. H-Bot only one bely run on the gantry, while CoreXY two. Where the CoreXY and H-Bot dby prot0typ1cal - CoreXY Machines
Re: Hlidskjalf, Dual CoreXY - 7 years ago
@ dc42, Challenge accepted.by prot0typ1cal - CoreXY Machines
Re: Hlidskjalf, Dual CoreXY - 7 years ago
dc42... am I to believe a RADDS version of RepRap is being worked on? RepRapFirmware-RADDS-1.19beta6.bin From the src file Pins_RADDS.h, looks to be out of date. The current max number of drives is 9 (line 21). Plus, lars seems to be ahead on the coreXYU kinematics, and seems to only exist in his fork. Though lars is behind on the RADDS beta. I've already registered on GitHub, if I can be oby prot0typ1cal - CoreXY Machines
Re: Core XY vs Hbot Build - 7 years ago
QuoteQdeathstar I think the problem with that is that they will fail gradually, and your printer will require recalibration as the plastic fails. True, but the same could be said if it was an H-Bot.by prot0typ1cal - CoreXY Machines
Re: Core XY vs Hbot Build - 7 years ago
BTW the_digital_dentist, I'm more than aware that printed plastic has around 1/10th the tensile and 1/20th the yield strength of 6061, and that's being generous. In the true vein of RepRap, 3d printed my parts, plus at the time hadn't access to make them out of aluminum. As the 3d printed parts begin to fail, and they will under normal fatigue, most likely replace them with milled billet. Been nby prot0typ1cal - CoreXY Machines
Re: Hlidskjalf, Dual CoreXY - 7 years ago
Thanks bobbyd Looking forward to see some CAD renders of your project.by prot0typ1cal - CoreXY Machines
Re: Core XY vs Hbot Build - 7 years ago
Quote691175002 ...The primary disadvantage of CoreXY is that it requires belts on two separate planes... False, most ppl go this route, like the C and D bots, because the asymmetry simplifies the design, and while the assumption may be that two tiered attachment torques the carriage more than the H-bot arrangement is variable on where the belt attachments are located. For "true" CoreXY, belts arby prot0typ1cal - CoreXY Machines
Re: Belts - Whats the best you can buy? - 7 years ago
Posted this pic on my CoreXYU build thread: Using 6mm GT2 PU steel cord belts, using 40T and 1" smooth pulleys. Geared down 2:1 from a 20T pulley with standard 9mm GT2 belt. Red pucks tension white PU belts, grey 4 bolt pulley sets slide to tension 9mm belt. Reduced tension on stepper, higher resolution final drive, more torque, and increased reliability.by prot0typ1cal - General
Re: Hlidskjalf, Dual CoreXY - 7 years ago
Thanks Lars! Yea, looking over your code. For RADDS/DUE imagine it will look something like this: case 1: // CoreXY machinePos = ((motorPos * stepsPerUnit) - (motorPos * stepsPerUnit)) /(2 * axisFactors * stepsPerUnit * stepsPerUnit); machinePos = ((motorPos * stepsPerUnit) + (motorPos * stepsPerUnit)) /(2 * axisFactors * stepsPerUnit * stepsPerUnit); machinePos =by prot0typ1cal - CoreXY Machines
Re: Hlidskjalf, Dual CoreXY - 7 years ago
Well, looks like ConTEXT is bunk, so installed Notepad++ Last RepRapFirmware for RADDS is over a year old: Ramble on...by prot0typ1cal - CoreXY Machines
Re: Hlidskjalf, Dual CoreXY - 7 years ago
Went here: Generated files as close as possible, and downloaded zip, extracted. I typically use Context for code. Some experience with Uscript for Unreal game engine, which is OOP. Haven't touched C++ in a really long time (20 years!). Need to download the PanelDue src, figure need to know what the RADDS/Due is doing first with RRF, so will hold off on extending the GUI for now. Time to dig.by prot0typ1cal - CoreXY Machines
Re: Hlidskjalf, Dual CoreXY - 7 years ago
Alrighty... Delving into the code realm. Absolutely using RepRapFirmware, and add CoreXYU functionality. Will also be looking at the PanelDue firmware to add "U" to the axis select for movement. Requires the Hall-e between carriages on the AUX_ADC circuit. More to follow.by prot0typ1cal - CoreXY Machines
Re: Hlidskjalf, Dual CoreXY - 7 years ago
With tech help from TDK-Lambda, power supply is 100% at 24VDC/1000W woohoo! Next week should get my ATP-5 aluminum bed material, and at that point wire up the extruders and work out a control panel/electrical box. Got the 7" PanelDue hooked up, and arduino usb driver working. Ready to flash the Due... only what do I use for this build? Want to use Repetier, though RRF looks more mod friendly.by prot0typ1cal - CoreXY Machines
Re: 3D Printer Design Guides for Custom Machines - 7 years ago
Just came across this: QuoteAbout this workshop The SimScale DIY 3D printer workshop series enable students, 3D printing enthusiasts, and professionals to learn how to use engineering simulation for developing and improving the design of a 3D printer. During three workshop sessions, participants will learn the fundamentals of engineering simulations and will expand their knowledge by improvingby prot0typ1cal - General
Re: Benefits of Reduction Gearing? - 7 years ago
Using the 2:1 ratio on my "Hlidskjalf" CoreXYU, only because will be using it as a CNC mill eventually. Most 3d printers will not benefit, as masses are low. However, gear ratios allow you to use smaller steppers, and since print speeds are relatively low, there is no sacrifice.by prot0typ1cal - Mechanics
Re: Hlidskjalf, Dual CoreXY - 7 years ago
Thanks dc42 and o_lampe, correct I have the V2 board without the wifi module. Will make a pin adapter That just leaves where to attach the Hall-E sensor for collision between the X and U carriages...by prot0typ1cal - CoreXY Machines
Re: Hlidskjalf, Dual CoreXY - 7 years ago
"wheels" are 1" diameter POM idlers, and 40T GT2 pulleys. Both were bored out and duel bearings installed. Another "DOH!" I have a 7" PanelDue, and the instructions say "Wire it to the 5V, TX1, RX1, and GND pins on the RADDS' AUX1 header"... Issue is that I have the 2 driver extension board, and Aux1 is already populated for the steppers for the two extruders.by prot0typ1cal - CoreXY Machines
Re: Hlidskjalf, Dual CoreXY - 7 years ago
Thanks angelo, What I need now is a new 24V PSU, today my TDK-Lambda went belly up More fan controls would be nice. I have 2x 3-wire filament cooling fans with no place to plug them in. Better news, here's a small update. Learned how to micro-crimp and started wiring between beer and BBQ in honor of the brave. Crux of the matter, seems I have one to many end stops. Would like to use a HallE beby prot0typ1cal - CoreXY Machines
Re: Hlidskjalf, Dual CoreXY - 7 years ago
Thanks for the heads up Lars. The race is on !by prot0typ1cal - CoreXY Machines
Re: Hlidskjalf, Dual CoreXY - 7 years ago
So far... over 2 grand (American). Considering the closest printer is the BCN3D, which is over $3k with shipping, and only a 210 mm x 297 mm x 210 mm print volume. Hlidskjalf build volume is 340 mm sq x 400 mm tall, though Z might drop to 370 mm to accommodate a front panel. Goal was only a 340 mm cube (13.37" cube), so all is good.by prot0typ1cal - CoreXY Machines
Re: Hlidskjalf, Dual CoreXY - 7 years ago
I think the firmware will be the only real hurdle, as a hybrid idex/coreXY isn't currently a provided configuration. DC42 could probably help you out if you were to use RADDS. You will also need to work out belt routing, while the two tiered CoreXY to make the CoreXYU was actually pretty easy and added symmetry to the design and use common components. Another item I didn't provide the math for iby prot0typ1cal - CoreXY Machines
Re: Hlidskjalf, Dual CoreXY - 7 years ago
DjDemonD, Well...let's break it down to math. CoreXY equations of motion: dX = ( dA+dB )/2, dY = ( dA-dB )/2 dA = dX+dY, dB = dX-dY CoreXYU equations of motion: dY = (( dA-dB )+( dC-dD ))/4, dA-dB=dC-dD dX = ( dA+dB )/2, dA = dX+dY, dB = dX-dY dU = ( dC+dD )/2, dC = dU+dY, dD = dU-dY Given the following (using Hlidskjalf's masses as reference build): X-Carriage = .30 kg Y-Gantry = 2.20 kgby prot0typ1cal - CoreXY Machines
Re: My coreXY design is progressing to the build stage - 7 years ago
Yea, that's well below the Tg for PC (147 C) The Dimension I used to run would heat the chamber to about 75 C and head to 280 C for ABS, as a result the belts would get cooked and crack over time. Well, years actually. Replaced them with polyurethane backed belts that have a higher Tg than neoprene. Even so, Gates Polychain belts are still only rated to 85 C, must be something to do with the nyloby prot0typ1cal - CoreXY Machines
Re: My coreXY design is progressing to the build stage - 7 years ago
Nice preassembled iris box. Evil print, I know Agree with the look of the 2 layer PC, can only hope it stays as cool as it looks when you add heat.by prot0typ1cal - CoreXY Machines
Re: 
Electronics for more silent printer - 7 years ago
I'd like to pimp RADDS True you need to add an Arduino Due Lots of features, can be run 12V or 24V, have 6 driver sockets and is 32 bit via the Due. I've found the support and documentation more than I need. Biggest boon, was I could add two more drivers with a daughter card, because I needed 8 (don't ask). Disclaimer. I have no affiliation with RADDS or Due. they just are decent and were thby prot0typ1cal - General