We are very pleased to announce the Versalab M4. It is not a brand new design, but the latest and in some ways the biggest upgrade ever made to the M3. It looks identical except for the belts.
We have completely upgraded the burr drive system. The increasing desire for light roast espresso has finally obsoleted the original system. The same DC motor is now driven with a very smart speed control board that has demonstrated its ability to prevent belt slippage while driving harder than the previous motor board. The drive belts have also undergone an upgrade. Now using two 3/8" wide belts, rather than the original 1/2" wide, the torque capacity is 150% of the previous design. Soon to publish a video of the M4 grinding 30 grams of Black Cat classic dumped into the top funnel.
There are no new pictures showing the drive belt arrangement, but it is simply a taller small pulley to handle the two belts which equate to a 3/4" wide belt (made dual to simplify installation). The same big front pulley is used. It is already 3/4" wide. Pictures on the website in a few weeks.
We are now having burrs made by SSP in Korea. They are not coated but made from D2 tool steel hardened to Rockwell 58. All M4 grinders will ship standard with SSP burrs. The burr design is unchanged but the quality and tolerances are vastly improved, as is the life expectancy.
The price of the M4 is $2,970.
In addition, we have finally created an optional lid for the top funnel. Clear acrylic with three black plastic acorn nuts to keep it centered. $18
There will be the ability to field upgrade an M3.