Stan

Some experiments on dealing with wrappers here: https://davehakkens.nl/community/forums/topic/soft-plastic-recycling-research-and-feasibility/

I looked at the Drill press designs before I built the desktop machine in the other thread. The things that influenced me were the stroke volume and force I could apply. Even with the Arbor press design, I started with roughly a 30CC stroke volume. This worked fine but was very limiting on what you can make (you don’t get the full stroke volume…[Read more]

Actually, something like this may be a little stronger https://alexnld.com/product/4pcs-201-stainless-steel-spring-toggle-latch-catch-hasp-clamp-clip-duck-billed-buckles/ . Looks like it should be in the cabinet hardware section of the store.

To find stuff I don’t remember the name of I usually guess and google images. I either find it or get…[Read more]

Like this?
https://www.aliexpress.com/item/32944069454.html

Congratulations, sounds like a great event response.

With a second small shop frame you could add an arbor press based injection machine. DIY:  https://davehakkens.nl/community/forums/topic/portable-desktop-injection-machine/page/3/ or something like this ready to go…[Read more]

“something which doesn’t involve things like a nut” 
Well, a bright orange pair of Vise Grips? https://www.amazon.com/Grip-Curved-Locking-Pliers-GR11105/dp/B008U4M0LU

If you are going to slot the top hole, then a stud (maybe a captive one that can pivot) and an orange knob might be easiest. You won’t have to unscrew the knob very far.

Looks like @patrick-bonsen used a similar configuration, perhaps he can comment on getting the spool off. Otherwise, perhaps you can borrow a gear puller or make an equivalent with a bar with a tapped hole on the center that you can then clamp onto the flange of the spool. A little heat on the spool core may help as well.
Good luck

Yes, the first few parts off of the machine would be some signs and plaques for the wife’s hobby….I know how this works.
The MPCNC design is intriguing and fits well into my interest in the build itself.
I’m still interested in exploring cheaper/softer materials for limited use custom molds.

Thanks, the TipBlitz is great. The CNC is too pretty for my garage.

I have been thinking of making one of the MPCNC routers.

Good luck. While you are getting rid of the bubbles, if your team comes up with a repeatable way to determine internal void volume (perhaps just a careful density measurement) that would be a great step.

One question is how the strength changes with repeated recycling.

Your data will be of interest to the community, hope you can post the methods and results.

@mariusbr , The parts you are making look like test coupons. I’m curious what the test plan might be if that is the case.

Those are great results.
I used an arbor press to provide the injection force in my DIY configuration. It works very well. https://davehakkens.nl/community/forums/topic/portable-desktop-injection-machine/page/3/
Thanks for posting, looking forward to how your improvements work out.

Have you seen this thread https://davehakkens.nl/community/forums/topic/polystyrene-transparency/ , especially the post by @imuh ? The image he posted is a lot closer to bubble free, perhaps he can comment on the process details.

The problem with concrete is that it is not dense compared to steel. The wheel in your second link is interesting in that filling the spoke area provides a lot of volume (and weight). If I was going to do that, I might add some wire mesh for a little bit mode reinforcement in case you drop the wheel during handling. You can also combine it with…[Read more]

It would help if you described your process design. Is it limited to industrial sourced material?

I love the results Vanplestik are getting but I didn’t think they were using filament. I thought they used flakes and beads directly.

@benjamin50 , For your flywheel, the moment of inertia is the key parameter https://en.wikipedia.org/wiki/List_of_moments_of_inertia . For a solid disk like the 20 Kg plate, the inertia is 1/2 mr^2 whereas for the bicycle wheel with the mass at the perimeter, it is mr^2. The radius of the plate is around 205mm and a typical bicycle rim is around…[Read more]

The waste plastic to usable 3D filament extruder will be a great invention. While some work is being done, this machine does not readily exist to my knowledge. Your solution to this problem may drive the design of the shredder (it may require very fine particle size).
Please post your extruder design concept. There will be a lot of interest.
Good luck

@thegreenengineers , It is funny, I noticed that for posts where I use Google Translate, it flips the day-month to the US sequence….