Like this?

http://www.thingiverse.com/thing:1244968

 

Yeah, thingiverse site is misbehaving. Will run it locally.

 

Here you go.

 

There's always a risk of overtightening, which is probably what I did also. Seems like a mistake everyone needs to make once or twice to learn from.

I suppose to make it idiot proof, you could design it so that the belt clamp is flush against the carriage plate when the belt is just snug enough between them instead of leaving a gap.

 

Shrunk the nub by 1mm, is that enough room?

 

I've added the YL-99 and Keyes style limit switches along with a generic mini switch to the generator. I don't have any of the YL-99 or Keyes switches yet, have them on the way, but I took a stab at the mounting hole dimensions. If anyone would like to try it out and let me know or measure the hole size and location, I'd appreciate it.

 

I have a 12x12 3 screw setup. I ran into an issue with leveling mine with 4 points. The leveling screws on the ends of the rail with the single screw twisted the rail instead of leveling the bed. Now I have 3 leveling screws, 1 at each lead screw.

 

Carl, would you mind if I add your direct drive extruder to the generator? Also is there interest in having a coaxial fan mount(s) in the generator?

 

No one has had any experience with this? I tried another hotend with the same results. I'm thinking it could be the drive gear (MK8 I believe). I got mine off Amazon I believe. Anyone have a suggestion for someplace to get the gear that has worked for them?

 

I'm guessing the different colors for the Z axis stepper holders are meant to be variations?

Not being able to decide how I want to build C-bot V1 will now hopefully result in me building V2...

 

So why the hexagonal holes in the motor mounts?

If you're going to stick with those, I'd rotate them 90 degrees so the "flats" aren't parallel to the build plate when you're printing.

 

Can you post your calculations for step calibration?

 

I have a blower/squirrel/centrifugal fan mount. Cool, just started the FRC season, so time is limited but should be easy enough to add both in the next week or so. Thanks.

 

I started with a default value and measured the amount of filament extruded vs the amount requested. So the calculation would be (REQ / ACT) * CUR where REQ is the requested amount, ACT is the actual amount, and CUR is the current step value. After doing that a few times, the actual amount of filament extruded is very close to the amount requested.

 

Hi All,

Just wanted to share a few pictures from the assembly of my solidworks-modelled (triple) c-bot.
I'm still designing the hotend carriage as i've got a volcano and standard v6 that need mounting. volcano for infill, and standard for everything else.

The extruder was based heavily on this thingiverse design (Compact Bowden Extruder, direct drive 1.75mm by schlotzz), but changed to accommodate a MK8 extruder gear, and 608 idler bearing as they're what I had lying around.

 

Ah. My bridging ability on my current printer is... "decent". I get a small amount of sag. One of the reasons for building a new printer is so I can upgrade the old one.

 

Ah, cheers Carl. It's a wanhao i3. Takes quite a bit of wrestling to get to where it can print reliably!

 

It literally took me a couple days, but I made it through (most) of this thread. Tons of great info in here. Great design by Carl Feniak and awesome collaboration between everyone. Pretty refreshing compared to some other forums. But I digress...

I'm looking to make quite a large machine, 1000x750 XY with about 500 Z. The end goal is to print large landscapes and architectural projects, not just a size competition!
I know it's going to be hard, but I'm wondering if anyone thinks I can use some of the concepts here? I'd really prefer the bed to not move *at all*, but I'm not really sure how to make such a large machine with CoreXY concepts. Would the belts simply be too long to scale properly - I'm thinking the belt elasticity might take it's toll or something? Not to mention moving a bed that large is probably insane.

Anyways, figured I'd ask the CoreXY people here if it's even feasible to scale up that large, I don't mean to hijack at all.

 

I thought of this printer when you mentioned a non-moving bed
Maximus 3D Printer | OpenBuilds

You could look into a concrete printer, the kind they use to print castles!

 

You might struggle to find a heated bed in a size to suit 1000x750.

Gt2 belts will also probably be slightly too stretchy for that size aswell. Possibly look into some sort of reinforced belt type with larger than a 6mm width to help alleviate. Although by doing that, you won't be able to use Carl's models, nor easily fit the belt into the extrusion slots.

Gt2 can definitely be bought in long enough lengths from aliex etc.

I'd also slice some models you're thinking of printing and take a look at the estimated print time at that size as you might be underestimating it. I can see it easily extending into the days rather than hours.

What's worth considering is a second infill extruder. I'm going for 300x300x340 build volume and a second 1/1.2 mm infill extruder is going to reduce print time massively on big solid models.

Are you dead set on printing models this big, whole?