Show all posts by user

Re: Prusa i2 ensuring Z Axis is Orthagonal? - 8 years ago

Coming back to this, calibrating my extrusion and axis steps per mm to get accurately sized parts before I print this calibration part. Using PETG, printed a 100x100x10mm part that when measured gives me as follows. Looking at my Prusa i2 from the front. Y Axis being the table that moves front to back, X being the carriage that moves left to right. Left: 100.1 Right: 100:10 Front: 100.24 Back

by blt3dp - General Mendel Topics

Re: Power supply for Prusa i2 - 8 years ago

I'm using an Antec 400w ATX

by blt3dp - General Mendel Topics

Re: NEW CoreXY Design - 8 years ago

Quotelkcl wood is elastic, therefore it doesn't matter how much you use (unless it's 8in thick), it's going to flex. a cardboard box is a very good (simple, cheap, easy, quick) way to illustrate the issue i'm communicating. I was pointing out that you can't draw a conclusion about the rigidity of his frame by comparing just a wooden box (his) to a cardboard box. He has an entire supporting str

by blt3dp - CoreXY Machines

Re: NEW CoreXY Design - 8 years ago

Quotelkcl ...in a cardboard box That would be a valid comparison if all he were using for the frame were a thin wooden box. He's using properly sized, and connected extrusions. Plus unlike our designs (my portable design too), he has proper bracing across the top. Those plastic corner brackets where the idlers go could be less than ideal for rigidity though. If I were going for that design,

by blt3dp - CoreXY Machines

Re: My coreXY design is progressing to the build stage - 8 years ago

Quotethe_digital_dentist I am thinking I'll make the motor mount in two pieces that fit together, a fixed piece screwed to the base plate, and a sliding piece that screws to the motor. The two pieces will fit together with tongues and grooves that will constrain the motor's motion to sliding and not tilting. This is exactly how I've designed mine too. Imagine Son of Megamax's X-Idler, but move

by blt3dp - CoreXY Machines

Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? - 8 years ago

What about something like a set of IR Break Beam Sensors? Kind of like the sensors on a Garage Door, if your Cat (carriage) runs under the garage door, the beam is broken and ends top is triggered. Have both them mounted static on the frame. Edit: Maybe something like this? https://www.adafruit.com/product/2168

by blt3dp - CoreXY Machines

Re: Inductive NPN Sensor Vs PNP - 8 years ago

Though it may still work below it's rated voltage, I'd still give it what it needs. I used a cigarette lighter USB charger, got it for cheap from one of the bins at my local Convenience/Pharmacy store. And I only had to solder a couple of wires. I took 12v and ground directly from the power supply. Directly to my sensor. I took the signal wire from the probe (which would output 12v if that's

by blt3dp - Reprappers

Re: My coreXY design is progressing to the build stage - 8 years ago

Actually was going to ask this question for my design. I was curious about the X Linear Rail being unsupported (not mounted to extrusion, etc), more so the how much weight it could handle before it would sag when the carriage moves along it.

by blt3dp - CoreXY Machines

Re: Foldable, portable CoreXY (Fusebox derivative) - 8 years ago

For your bearings binding up, check to see if the rubber seals at the end are dragging. I found that to be a problem when I got cheap bearings. I ended up trimming the lip off of them.

by blt3dp - CoreXY Machines

Re: Foldable, portable CoreXY (Fusebox derivative) - 8 years ago

Quotelkcl Is the belt going to rub on the ends of the smooth rod there?

by blt3dp - CoreXY Machines

Re: Inconsistent extrusion after changing to bowden setup - 8 years ago

Is the bowden tube long? It should be as short as possible. That there aren't any twists or bends in it that may increase the friction in the tube. I'd also say make sure the motor isn't a short one, they don't have enough torque. You'll want the body to be at least 47mm. And you'll want to be running it at at least 80% it's rated current. You may have to adjust the Stepper Driver, measure,

by blt3dp - Prusa i3 and variants

Re: Inconsistent extrusion after changing to bowden setup - 8 years ago

Mk8 drive gear leads me to believe you're still using a direct drive setup, just converted to bowden. A direct drive extruder may not have enough power to overcome the friction in the bowden tube. You'll probably want to switch to a geared extruder design, or maybe change out the motor for a geared one.

by blt3dp - Prusa i3 and variants

Re: Measurements of Misumi 2020 and Hiwin MGN12 - 8 years ago

Thanks for the measurement, that's what I needed. I figured when doing the openscad code that it'd be close to 1mm. Anyone with a Kossel could take some measurements of MGN12 rails?

by blt3dp - Extruded Aluminum Frames

Re: Measurements of Misumi 2020 and Hiwin MGN12 - 8 years ago

Yes please, it's the only one I don't see on the datasheet.

by blt3dp - Extruded Aluminum Frames

Re: Do CoreXY belts need to be of equal tension? - 8 years ago

For a while I've been thinking of ways for me to easily tension my belts, and have a way to look over and just know. Here's what I've been thinking about, envision this. Start with your standard CoreXY setup, without the belts installed yet. Motor mounts slide and are adjustable with a thumb screw, thumb screw pulls motor mount away from opposite idler, thus tensioning the belt if were installe

by blt3dp - CoreXY Machines

Measurements of Misumi 2020 and Hiwin MGN12 - 8 years ago

Would someone who has Misumi 2020 and Hiwin MGN12 take a few measurements for me? These aren't really on the datasheets. I've attached an image of the ones I'm looking for.

by blt3dp - Extruded Aluminum Frames

Re: Auto bed leveling echo endstop hit z - 8 years ago

Make sure this line is set to false: #define min_software_endstops

by blt3dp - Printing

Re: Axes not moving properly - 8 years ago

Sorry, didn't see you replied. I'd say for the first thing, make sure you've got 3 jumpers installed under each of the stepper drivers on your RAMPS board. That causes wierd movememt issues like that stuttering sound As far as determining which side is Left or Right, It doesn't make much difference because you can reconfigure stuff to make it works Generally, the Y Axis motor will be at the b

by blt3dp - General Mendel Topics

Re: CoreXY belt / idler juddering issue (belt teeth against bearings) - 8 years ago

How about this? Keeps the motor inboard, puts the teeth on the outside of the idlers, no twist in the belt, requires one less idler.

by blt3dp - CoreXY Machines

Re: Foldable, portable CoreXY (Fusebox derivative) - 8 years ago

I saw that issue on my printer. I had what appeared to be really straight M8 thread rods. But even a minimal bend, even undetectable to our eyes could cause them. Lacking an actual lead screw, which would be preferred, I went to M6 threaded rods so they don't fight with the smooth rods. I also decoupled it from the Z Axis so it could wobble and not affect it. I used something like this, http

by blt3dp - CoreXY Machines

Re: Retraction optimization - 8 years ago

@CTCHunter1 What were your settings when you were using Hexagon and Bowden? I'm actually just finishing up with the hardware install of the same thing.

by blt3dp - Printing

Re: Foldable, portable CoreXY (Fusebox derivative) - 8 years ago

That's looking from the top down when it's in deployed setup?

by blt3dp - CoreXY Machines

Re: Axes not moving properly - 8 years ago

Something's wrong with the endstops. If you send M119 it'll report endstop status, they should be OPEN unless actually pressed. Try holding an enstop switch closed with your finger and sending M119 at the same time, see if it reports the opposite of it being unpressed. Also post your configuration file and what location the enstops for X and Y are at (Eg, Left or Right for X, Front or Back for

by blt3dp - General Mendel Topics

Re: Mating Issues Between Two Printed Parts - 8 years ago

Slic3r's doing the math for extrusion width and following that. Slic3r knows that plastic exits the nozzle and actually swells to larger than the size of the nozzle, Eg. Die Swell and that the layer is squeezed onto the layer before it, thus the extrusion width. A .4 nozzle doesn't create a .4 width line, it'll probably be something like .67. If you design a part at .4 wall thickness, you'll

by blt3dp - Printing

Re: Foldable, portable CoreXY (Fusebox derivative) - 8 years ago

Sounds like is coming along. Pretty good for a first print. The bridge came out good. While the corner cubes sound like they'd help, It's been proven they reduce rigidity over connecting the extrusions directly to each other, but rather add extra parts (however insignificant). Connecting them directly like this would be more rigid Dentist's Post on connecting Extrusion. and require less parts

by blt3dp - CoreXY Machines

Re: RepRap Samuel - A variation on the Mendel - 8 years ago

I've been printing parts for a couple of months (only have 1 day a week with enough time to even start a print). Got everything printed and was pretty assembling the X-Idler, using 623zz bearings and it appears the part (pulled from the github) wasn't designed for them. The space is too wide. I redesigned the part to fit them perfectly, maybe a little too well, the ABS shrunk a little and I ha

by blt3dp - General Mendel Topics

Re: New to reprap---having a little difficulty...trying my patience - 8 years ago

I'd unplug the hotend cartridge wires from the RAMPS, leave thermistor plugged in If you have it unplugged, it shouldn't run away on you, it should read the room temperature If it still goes MAXTEMP, I'd check to make sure the thermistor wires aren't shorted (exposed wire touching each other) It could also be a bad thermistor If it seems fine without the hotend cartridge plugged in, but gives t

by blt3dp - Prusa i3 and variants

Re: Foldable, portable CoreXY (Fusebox derivative) - 8 years ago

Sounds like you're close to getting it running. I'd like to see it's first prints. Also roughly how much Z travel do you estimate? It looks like the hinge system may take quite a bit.

by blt3dp - CoreXY Machines

Re: won't compile - 8 years ago

delete

by blt3dp - Mechanics

Re: RepRap Samuel - A variation on the Mendel - 8 years ago

You said in the other thread that the i3 kit was a wood frame. I'd pass on that regardless the cost. Go with the i2 stuff with the potential for an upgrade to Samuel.

by blt3dp - General Mendel Topics