Show all posts by user
Discuss any sort of mechanical stuff here: positioning systems, gears, extruding methods, etc.
Re: CNC with Sanguinololu/GRBL? Advice needed 
- 11 years ago
I would try a different baud rate. XLoader seems to be the recommended way to download GRBL, would that help?by bobc - CNC Routers, Mills, and Hybrid RepRapping
Re: Update on the E3D All Metal Hotend (Now finally shipping!) 
[Lots of pictures] - 11 years ago
So this is my interpretation based on Tg is achieved somewhere in the heatbreak region. Below Tm is the filament is fluid in the melt chamber. There is a taper from the inlet down to the top of the melt chamber. Does that look right?by bobc - General
Re: Changing the Fuse settings to a 1284p using an Arduino Uno as ISP - 11 years ago
Have a look at Memory size of the target should not be a problem.by bobc - Controllers
Re: X axis Stepper only moves one way (Melzi v2 board) - help request - 11 years ago
Check the endstops with the M119 command, that tells you what the firmware sees.by bobc - Controllers
Re: X axis Stepper only moves one way (Melzi v2 board) - help request - 11 years ago
It's quite unlikely that a motor driver has failed in such a manner. It should be possible to identify the problem and fix it or work around, before buying a new board. Usually a motor only moving away from the endstop means there is a problem with the endstop, so I would check that again. If one of the motor wires has come loose, it can lead to motor always moving in one direction, but that teby bobc - Controllers
Re: Invitation to a Extruders and HotEnds Google Group - Comments, suggest and share! - 11 years ago
The CC-BY-NC is not an Open Source license, so you can't really call it an Open Source project.by bobc - General
Re: High Speed Printing - 11 years ago
TinyG uses a slightly faster CPU than typical AVR Arduinos, but the clever bit is in the firmware which implements constant jerk motion, all other firmwares do constant acceleration with some hacks for jerk. In principle the same algorithms from TinyG could be applied elsewhere, it's open source. The TinyG uses 2.5A TI DRV8818 similar to DRV8825. The printer in the video of the OP is using Linuxby bobc - General
Re: Azteeg X3 - Secondary power input for stepper motors - 11 years ago
I am not sure why you conclude that the motors are not getting enough power. Unfortunately running at lower voltage is unlikely to help. The stepper drivers run in a current limiting mode, so the motors will get less than half power from 5V vs 12V. The SD8825 should be able to provide plenty of current for the motors. have you tried increasing the current limit? I would advise running a seperateby bobc - RAMPS Electronics
Re: Very quick question about how to power Arduino WITHOUT USB connection. - 11 years ago
There is not much that can go wrong with D1, unless it is the wrong way round. Something to check for?by bobc - RAMPS Electronics
Re: .4mm filament - 11 years ago
Moore's Law is probably one of the most misapplied laws outside of it's original field. Moore's Law works when applied to computing because you can miniaturise information processing without losing anything. i.e. a small transistor can process a bit equally as well as a large transistor, but having a small transistor has a whole host of benefits. What works for bits doesn't work for atoms. Youby bobc - General
Re: Reprap Protos V2 Advice - 11 years ago
I'd not heard of PRotos v2 before, but there are now hundreds of printer designs. The German RepRap scene is quite active but probably has little visibility outside german speaking forums. So specific advice might be lacking, but general principles can be applied. You seem to be on top of things anyway.by bobc - Reprappers
Re: RepRap project, just no sure how to do it :{ - 11 years ago
I have to say that is quite an ambitious project, assuming it is even possible to print "blood vessels". Provided you have enough money, building the machine won't be a problem. You might need a lot of money.by bobc - General
Re: Print mirrored - 11 years ago
Of course, you need to reverse the right axis, otherwise you end up with the print rotated with respect to the display. It's invariably the Y axis that needs reversing, because that is the "confusing" one - the bed moves instead of the head. To expand a little on my previous answer, if homing "works correctly" it is not enough to determine the right axis directions. The homing sequence does notby bobc - RAMPS Electronics
Re: Print mirrored - 11 years ago
If a print displays correctly on screen, but prints reversed, then one of the axes is reversed. There is no other cause or solution.by bobc - RAMPS Electronics
Re: New aluminum profile for delta like printers, reducing nb of parts - 11 years ago
There doesn't seem to be sufficient demand to keep Makerslide in stock anywhere in Europe, so I can't see there being much of a market for something even more specialised. Some custom brackets for regular alu profile might be useful though.by bobc - Delta Machines
Re: Print Stops 2 minutes in - 11 years ago
Looks like a software problem. If you are running Repetier Host, turn off 3D visualization. Also check the gcode file, Slic3r can generate incomplete files.by bobc - RAMPS Electronics
Re: DIYtechshop - Help Thread - 11 years ago
QuoteDoug1 Its there ... so probably cooked then ? Of course, it has to be there AND the right way round. It could also be a bust 5V regulator on the Arduino. The only way for you to resolve your issues is to investigate your own board, forums can provide advice on how to do that, but ultimately you have to do something.by bobc - General
Re: Constructive criticism sought - 11 years ago
Fuse holders look like they are Keystone mini-ATO type I came to the conclusion that the RAMPS 1N4004 D1 is ineffective, the surge rating is only for a few ms, whereas it takes a lot longer for a PTC or fuse to trip.by bobc - Controllers
Re: Rostock future version Firmware progress - 11 years ago
Yeah, I think that plan is quite out of date. I'm not sure why GRBL was mentioned, it doesn't seem to be particularly advantageous for Deltas, and the core algorithm from GRBL is now implemented in a lot of other firmwares anyway. The idea of writing a super new firmware that works for any type of non-cartesian kinematics, and takes advantage of the ARM processors is still a good one I think.by bobc - Delta Machines
Re: why delta not list on the Build a RepRap page? - 11 years ago
The link "Build a RepRap" redirects to . There are several printers on there that are somewhat obscure, very new and not yet released or not even really RepRaps, so I don't think it is because there is a lack of a "go to" delta or because they are too new. Like most of the wiki, it is a rather arbitrary list of stuff, so lack of Deltas probably just means no one thought to add one. That page coby bobc - Delta Machines
Re: Bed construction - a word of warning! - 11 years ago
It is generally believed that these type of kits do not fall under CE directives and therefore do not require a mark. The issue is not clear cut, and seems to hinge on the interpretation of "product" meaning "manufactured article", although there is no specific exemption for "kits". The vast majority of products sold are finished articles, so it might be natural to assume that "product" means "fiby bobc - Ormerod
Re: Introduction and a small problem. - 11 years ago
Welcome to the Third Dimension! The coordinate system is relative to the position of the print head. So when the bed goes one way, the head goes the other way relatively speaking. You have to imagine the bed is stationary, and the print head moving. It takes a while for this mental flip to take place. This often causes people to set up the printer the wrong way, and the effect is that the printby bobc - Reprappers
Re: RAMPS for Due! - 11 years ago
I tend to build prototypes using ordinary 0.1" headers, it's cheaper and for motor connectors easier to swap direction. The intention was to allow any type of connectors - latching/non-latching, polarised or not, or screw terminals, but anyway in practice it's impossible to prevent people using any type of connectors. The issue of pin 1 is problematic, pin 1 is not well defined even for the latby bobc - Controllers
Re: Constructive criticism sought - 11 years ago
Some nice features there Are there stepper drivers with the vref on a header pin? There was another guy with a blown board today due to "slipped screwdriver", it would be great to eliminate that weakness from RAMPS. Isolation on the USB is a neat idea too.by bobc - Controllers
Re: DIY 12V supply for the budget-conscious - 11 years ago
There is loads of great info on converting server PSUs on the rcgroups forums, they cover a lot of models, although not all of them. I've found for models that don't have adjustable fan speed, the Zalman Fanmate is perfect because it provides 5-11V which ensures the PSU always turns on, and is also easy to fit by swapping a couple of connectors.by bobc - Ormerod
Re: Short circuit - 11 years ago
I guess that the MOSFET for the heatbed has failed short circuit. You would need to replace it.by bobc - General
Re: Why is acme rod good? - 11 years ago
Heh, I do feel sorry for the OP in these situations. He asks a quite reasonable question, but he gets a range of replies with conflicting information, some of it nonsense and some nuggets of useful information. The strength of feeling an opinion is made with does not correlate with the quality of information, unfortunately. Good luck sorting that lot out!by bobc - General
Re: Why is acme rod good? - 11 years ago
I think what people call "Z wobble" is better called Z banding. Z banding is a combination of Z wobble (movement in the X-Y plane) + Z non-linearity (non linear motion in the Z axis). There may be a further effect due to layer height not being an integral multiple of the full step size, I am not sure on that one. Eliminating one effect does not necessarily eliminate the other. I think confusionby bobc - General
Re: RAMPS for Due! - 11 years ago
Quotecdsteinkuehler Quotebobc I'm confused by your comment though, the TLV431 isn't intended to generate 3.1V, but to sink current if the voltage on OV_REF exceeds 3.1V. That was my understanding of how the protection circuit is supposed to work anyway. Yes, it's a standard shunt regulator (basically a fancy zener diode). My comment relates to the fact it appers the output is supposed to be 3.1by bobc - Controllers
Re: Wiring Rumba (questions) - 11 years ago
Your wiring order looks good, maybe there is some other reason the motors don't turn?by bobc - Controllers