Just one bonus formula for now.

Use it with other two to get a customizable alternation mode.

Mandelbulb3Dv17{
Y....UZ....K0...w....2....EWpBNKxi50.9kY1ZYxnQ1EnwNLl2j2xyPFsIMHgxl3zu/2dEyktkyj
................................/muevZDc..2........Y./..................y.2..MtE
................/M.0/......n....A0....E2.....A6xyV.U8kpD/.........Uy/dkpXm1.nAnA
z.....kD12../.UyeY7uaafSzYKamONg.U.k2ERwmAd0..2............u1....y1...sD...../..
.z1...sDqCm7UJroHxHJZGtDvs1Uyy6Fl6ISIDpjP/iQhXKomqvM5HW/.e.LzQ6rFG7csPcjnQkq1Z5p
Hx1KZGtDvs1UyMoGxtJRHDpD......oI..............kD.2....sD..kz0...................
.............oAnAr1...sD....zU/Si9.isti.MZbv0UTSi9.auti.sgbv0UxSi9......C....k1.
..................kz.wzzz1.U..6.P....M4...EB....W....k1....F....8/...I1.....SF52
...U.qFG9yzb2zzzRYoWzz7lz16.mc..zXCc..k18XGQeGyD/sIRhrVAkz1..........2.28.kFrA0.
.Ub96aAIVz9.1se7Umvxz0........../6U0.wzzz1................................E.0c..
zzzz.................................2U.8.kzzzD.................................
/6U0.wzzz1...................................2CcN/UvNP6.eeWCNq0.yRii.EJJUk1f..XR
S1.mx3CcN/UvNP6.QsLsUa3.ibhV..bTV1OK.sSq40.ly3CcN/UvNP6.MwLsUa3.ibhV.kqTV1OK.sSq
40.kz3CcN/UvNP6...EsUa3.eeWCNq0.IJ36wk8.wyLsUa3.................................
E....A....E.....I....A....kL1xaPYlISV/LRixaR.........................6U.0.......
.................K7s./.........E........6.2.....................................
................................................................................
.....................2.....3....5....oINiRKNmZYFH/kRZ75.........................
.....MU/4......................E........kz1........wz.........yD................
................................................................................
................................/....E/...k/....BJaPbJaQ7NoI.QLNm/..............
................4MU/....................6.2........wz.........zD........Uz1.....
................................................................................
............................................}
This is a custom alternation of Menger scale 2 (filled box) and scale 3 (holed box)
