Monthly Archives: June 2014

Scotch Blue = Tesa Precision Outdoor

“Get some Scotch Blue” they say. “Scotch Blue is the best for getting PLA to stick to the printer bed” they say…

Sadly I don’t live in the greatest country in the world so there is no Scotch Blue in my local hardware store. But there is Tesa. And Tesa wouldn’t be Tesa if they wouldn’t offer adhesive tape.

So ‘blue’ I thought over and over again as I wandered the endless shelfs of the men’s boutique also known as ‘local hardware store’ which is just like what a shoe store is for women. And I found what I wanted to find. Blue painters tape. Made by Tesa. Named ‘Precision Outdoor‘. Precision = perfect. Outdoor = even more perfect. So I can finally print in the woods. Enough of the pun. No Pun intended.

The tape is 6.50€ for 25m. That’s ‘OK’.
So I applied that stuff to the printer bed, finished my first print and hell….this stuff is good. The PLA stuck to the tape like the devil to the poor soul. It nearly felt like the whole thing was CA-glued to the bed. Maybe a bit too much but I don’t have to heat up my printer bed which also reduces overall printing time.

Sticks to PLA like the devil to the soul.

Sticks to PLA like the devil to the soul.

IMG_1813

Layers underextruded [SOLVED]

The extruder freshly calibrated but anyways I am getting underextrusion, or at least it looks to me so, on the following layers after the first layer.

This is a picture of my first layer. Wonderful.

First layer

First layer

 

The second layer (Shells = 2) is fine with some error but then the 3rd and following layers are totally messed up.

Third layer

Third layer

 

Why this happens, I don’t know. The bed is leveled, the extruder is calibrated and the filament is fed without force.

 

UPDATE:
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Customized QU-BD TwoUp Issues #1 – Heat Bed

Hello dear reader

on a constant basis I want to write about the issues and design imperfections of my QU-BD TwoUp 3d printer. There are a lot of issues which I try to fix and posts the findings and results here.

So off we go with an issue that from the first look does not look that of a problem.

The heat bed

The heated bed is a piece basalt with a heat pad glued to the bottom. The heat bed itself resides on a cut-to-fit MDF piece with 5.6xxxx mm thickness. Damn those non-metric measurement.

1) Under the weight of the basalt bed the MDF piece deflects.

Solution: Replace MDF with aluminium or strong acrylic glass piece.

2) Heat pad is glued not aligned to the basalt bed. The cut-out middle section in the MDF therefore distorts the whole basalt bed. The holes in the MDF piece which are used to secure the basalt bed are off. Way off. Being slightly twisted, the heated bed is not aligned nice with the Y and X axis hence reducing the print volume slightly.

Solution: Remove heat pad and realign it.
Solution 2: Sand of parts of the MDF so that the heat pad/heat bed can be aligned with the x/y axis.