I'm in the UK. Acrylic panels supplied by www.razorlab.co.uk. 3D side cheeks and the 4 mounting bushes from https://midlands3d.com/ . Both companies produced excellent components from the design files. I did have 2 problems with my first Teensy 4.1. The first was my fault - I left too big a gap between the cpu board and the audio card - this resulted in the assembly being too tall to fit in the case. The 2nd problem was with soldering the USB client wires to the underside of the Teensy. The solder pads are so small that when I bent the wire back to fit on the main PCB, one of the pads pulled off the Teensy completely with no way to repair. Fortunately, the USB client could still be accessed via the micro usb connector on the Teensy board itself. As a result of the above problems, I built a 2nd Teensy/Audio card combo being careful to keep the 2 of them sandwiched close together but ensuring no components touched each other. This time, when I soldered the data lines onto the bottom of the Teensy, I added a blob of superglue to reinforce the fixing.
The only other point of note during the build was in adding a 100 ohm resistor into the SCK line to reduce the background noise at high volumes that some have commented on. I cut the track on the main PC with a craft knife and the soldered the resistor directly from the back of the Teensy to the solder pads of the display - worked a dream.

How does it sound -fantastic! Really deep base and crystal clear highs. Some very nice sounds amongst the factory supplied patches. I'm not much of a sound programmer and am looking forward to the user community making more available. One development to the firmware that would be very useful is a mode to put the unit into USB Mass Storage mode (ala PreefFM2) to enable patch files to be backed up and added from a host computer. Recommended - go and get one!

Arrived very quickly after order- well packed and the quality is superb - much better than I was expecting

I am gathering all the other bits to build next winter

Not build anything for about 35 years, so it's going to be fun

Can't seem to find a user forum/group anywhere - Facebook?

Does anyone in the UK know who can print the 3mm acrylic panels for the case?

It took several sources to piece together the complete bill of materials to assemble this synth (e.g., PCB from Tindie, front panel from JLCPBC, acrylic case from Ponoko, Teensy boards from PJRC, various parts from Mouser and EBay, plus several self 3D Printed components, etc.). However once I had everything in hand, the build itself was quick and easy, by current DIY standards. If you've ever tried to build a MIDIBox, Ambika or x0xb0x synth, you'll find this much easier.

Now that my build is complete, I'm having a blast jamming with this synth using either Ableton live, Reason or Logic to sequence patterns, rhythms and melodies. The polyphony is great, because you can play complex chords, or even multiple tracks that use different presets.

I also love the fact that I can dig through the code in my Arduino IDE (Teensyduino actually), to learn how certain Synth features were developed and implemented.

Highly recommended!

I bought the bulk order - mainly because there was no shipping option to South Africa for the one-off synth, so I didn't get all the additional bits (display, 3d printed parts), but it was still pretty straight forward to get everything together. The Mouser bill of materials is a great start, although I found many of the parts out of stock and I spent a little time hunting down alternatives (of which there are plenty). Soldering is a little more than basic, with some of the through pins requiring a little care, but not at all difficult. The instructions are clear and step by step. I 3d printed my own display mounting from the files - the threads didn't come out well, but it works fine anyway. The only place I went wrong was not checking that the display I got had the backlight enabled by default - it wasn't, and the jumper to do it is on the bottom, so I had to add a wire between the backlight pin and 3V3, not a major problem, but do check before you solder it in if you want the neatest build.

I am running the synth without an enclosure while I wait for local industry to start up again in the new year to have that manufactured. It works out of the box with my USB midi keyboard and with Ableton Live.

The communications around ordering was excellent and the seller is very responsive and helpful.

I had a great experience so far and I only just got started. I highly recommend the TSynth - whether in bulk or single order.

Took 8 days to arrive. The boards are good quality with well soldered SMD parts. Well packaged and delivered directly from fabricator. Looing forward to building them.

Would be nice to have the option to use EuroPacket delivery from the fabricator. It only takes a couple of extra days to the UK and you prepay the taxes. Works out a bit cheaper as you don't have to pay the DHL handling fee, just the taxes.