Great Design and great project.  I was printing the Nema 17 version when I found the Nema 23 version and in the process of switching over since I have not bought the hard parts yet.  Question, on the Nema 23 version for the controller mount I assume that is a standard 120mm PC cooling fan.  Is that correct?  Also, I realize that you are, for good reason, supporting StepperOnline.  However, there are 8mm Nema 23 steppers available for the Z axis if you are interested.  

Last, proving I am a newbie here these questions are about as basic as they get...I have been 3D printing for 18 months.  So, I know how to take a 3D design from CAD to STL to G code and print it.  But, I have seen no good videos on the normal process for taking a 3D router design from CAD to transfer it to G code and load it on the machine and execute it.. Is it basically the same process?  Is CAM software basically the same as slicer software?   Thanks again for a great way to get started in CNC machining.

@shoe , first of all, good idea, I will list all the common question in a FAQ

@leemaisel on thingiverse you have the first version of the topsCNC, the "TopsCNC V1" which is a good one for small size, and here on the website you have the "TopsCNC Heavy" which is heavier version of the V1, for larger size. You have also the Nema23 Heavy version if you want to use Nema23 motors

@jadoglio nop it's a 90mm fan ahah, however, I made a video "from draw to cut", in this video i explain how to draw a CAD design, then how to generate a GCode, and finally how to send it to the CNC, is it what you looking for ? here is the video : https://youtu.be/LKa4eeFVlHg

For All, sorry if I can't answer all your questions, I try to do my best, but sometime it's difficult

Topsie..Thanks for the quick reply and I will look at the video soon. I also noticed that the new stepper driver/power supply configuration only has 3 stepper drivers. With 1 for X, 2 for Y, and 1 for Z, I assume we will still need 4 like we did with the shield. I am assuming the new drivers can control more than one motor and you are connecting the two Y axis motors to the same stepper. Is this correct, or am I missing something? I assume we still need the Arduino and it will be used as in the video below and we will not need the shield?   Thanks again!

This is the best video I have found so far for wiring a rig like this but again it only has 3 steppers 1 for each axis. Build a CNC Controller with Arduino, TB6600 and GRBL

@jadoglio : in NEMA23 version Topsie put only NEMA23 on Y(2x) and X axes so 3 steppers and 3 specific driver. For Z he keep the NEMA17 and DRV8825 driver on CNC shield

Given the amount of time I have put into this project just researching it for parts, assembly, and electrics I can't image how many hours you have in it.  You have great dedication and initiative to keep this development going.  Thanks. 

A couple more questions..sorry..In the NEMA 23 stl parts list several parts are listed as MAYCHANGE,.the same part is listed along with it as T8 to T14. Is the T8 to T14 version final? Should I ignore the versions that say MAYCHANGE?

What does T8 to T14 refer to?  

Also, some part names indicate NOTTESTED. From the video it looks like you built the machine with these parts so I am confused. Are they final, or are they still experimental for some reason?

Can anyone on this forum provide any insight on  this question?  Thanks

Last question for the day...

The stepper motor power supply is 36V 9.7A.  I assume the fan and the Arduino are 12v.  Are you using two power supplies, or are you using buck converters on the devices that are 12 v connecting them to the 36V power supply?  Thanks again and sorry for being a pain....

IDEFIXES...thanks for clarifying

What Router bit did you use to Bevel the Rails?

 I haven't received my Arduino yet, but I wonder if I can use the Arduino as a power source for a fan? I have 5V fans. How can I connect them to the Arduino board? Or can the CNC Shield act as a power source?

Short explanation: I will power my spindel with 18V. The CNC shield and the steppers is also supposed to be powered with 18V, so I can use the same power supply. The Arduino is connected via USB to the PC, so it will gets its power from USB. I don't have a 24V fan, which I could power with the 18V power supply. I have 5V to 12V fans (many).

The options I have left are to use the Arduino itself or the CNC shield as a power source for a 5V to 12V fan. Can this be done somehow?

Bonjours d’about un grand merci à Topsie pour tout son travail et son partage et merci a vous tous pour vos partage et aide dans le Forum.

Je suis à faire les achats de mes pièces pour une TopsCNC le première model plus petit en blanc, j’aimerais vérifier la dimension requise pour les Profilé et vis T8. Je pense avoir trouver les dimensions requises ici, mais je suis un peu confus avec la TopsCNC Heavy que je ne veux pas

Mes besoin pour la Surface de travail sont en Axe X de 800mm et en Axe Y 500mm.

Alors Axe X : 800mm = Profilé de 1000mm et Vis T8 de 900mm

Et Axe Y : 500mm Profilé de 750mm et Vis T8 de 650mm

Merci Beaucoup Paul